MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs for added versatility. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells, they come in options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum plating. RoHS certified finishes are available, ensuring environmental compliance. Ideal for military applications and more, these connectors provide reliable performance with a mating type of bayonet and a service rating of I, meeting MIL-DTL-38999 I specifications.